How can I get parameters from a URL string?

I have an HTML form field $_POST["url"], having some URL strings as the value.

Example values are:

https://example.com/test/[email protected]
https://example.com/test/1234?basic=2&[email protected]
https://example.com/test/[email protected]
https://example.com/test/[email protected]&testin=123
https://example.com/test/the-page-here/1234?someurl=key&[email protected]

etc.

How can I get only the email parameter from these URLs/values?

Please note that I am not getting these strings from the browser address bar.

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